(van der Wulp, 1861)
Body
Medium sized larvae with a length up to 10 mm. Living larvae are green with many white spots. Thorax and abdomen have tiny longitudinal folds (50x magn.). Fringe of swimming hairs absent (Wiederholm, 1983; Moller Pillot, 1984a).
Head
The head length is 0.7 - 0.8 mm, twice as long as wide with a cephalic index of 45 - 50 (Moller Pillot, 1984a).
Antenna
The antennal segments are all yellow and the antennal ratio is about 6. The ring organ is situated at 0.4 - 0.5 of the height of the first segment. The second segment is normal and lacks a tuning fork Gut flagellum (Wiederholm, 1983; Moller Pillot, 1984a).
Mentum
Dorsomentum without teeth (Wiederholm, 1983).
Ligula and paraligula
Ligula with 5 brown teeth in a concave row. Paraligula with a long outer and a smaller inner tooth Gut ligula paraligula (Wiederholm, 1983; Moller Pillot, 1984a).
Mandible
The mandible has a large basal tooth.
Maxilla
The maxilla is short with an undivided basal segment.
Anal tubules
4 anal tubules are very short, not longer than wide and only about 1/7 of the length of the posterior parapod Gut anal tubules (Wiederholm, 1983; Moller Pillot, 1984a).
Posterior parapods
Some claws on posterior parapods may be brown. Three small yellow claws with teeth.
Differential characteristics
The short anal tubules are unique in the Tanypodinae Gut anal tubules. Also the longitudinal folds in thorax and abdomen and the head which is twice as long as wide, make Guttipelopia easy to distinguish.